Machine for grinding blades of table-cutlery



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O.E.ROBERTS. MACHINE FOR GRINDING BLADES 0F TABLE GUTLBBY. N0.547,893. PatentedOct'. 15; 1895.

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G. E.-ROBERTS.

MACHINE FOR GRINDING BLADES 0F TABLE GUTLERY. No. 547,893.

Patented Oct. 15, 1895.

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v G.B.ROBERTS. MAOHINE FOR GRINDING BLADES-0P TABLE OUTLERY.

' Patented Oct. 15, 1895.

.Zv VEN TOR: CHARLEsEFOBERm Unrrsn STATES 1 ATENT D CHARLES E. ROBERTS, OF OAK PARK, ASSIGNOR TO THE NATIONAL OUTLERY COMPANY, OF ROCKFORD, ILLINOIS.

MACHINE. FOR GRINDING BLADES OF TABLE-CUTLERY.

SPECIFICATION forming part of Letters Patent No. 547,893, dated October 15, 1895. I

Application filed February 11, 1895 Serial No. 638,040- (No model.)

To all whom it may concern..-

Be it known that 1, CHARLES E. ROBERTS, acitizen of the United States, residing at Oak Park, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Machines for Grinding the Blades of Table-Cutlery, of which the following is a specification.

This invention relates to a machine for the automatic grinding of the blades of table and similar knives. In this machine the knife is secured to a holder which is pivotally supported and adapted to oscillate to the extent necessary to give a rounded surface to the blade, and it is mounted in a frame which is also pivotally supported and adapted to oscillate in obedience to a form. The holder and form are also actuated in a longitudinal direction to the extent required to carry the blade across the face of the grinding-wheel. The oscillation of the knife-holder is caused by a heart-shaped ca m and a bell-crank lever, one end of the latter being actuated by the cam and the other end whereof being joined to an arm projecting from the holder in such manner as to rock the holder when the lever is actuated by the cam. A spring opposes this oscillation and maintains the lever in bearing-contact with the cam. All these features of the machine are fully disclosed in the accompanying drawings, wherein- Figure 1 is a plan view; Fig. 2, a longitudinal vertical section upon the line 2 2 of Fig. 1. Fig. 3 is an end elevation. Fig. 4 is a section on the line A 4. of Fig. 1. Fig. 5 is an enlarged side elevation of the knife-holder. Fig. 6 is a section on the line 6 6 of Fig. 5;

and Figs. 7 and 8 are sections on the lines 7 7 and 8 8, respectively, of Fig. 6.

In the drawings, A represents a suitable supporting-frame, upon which the moving parts of the machine are supported. B is the grinding-wheel, receiving its power from the pulley b and journaled upon a frame 0 pivotally supported upon a pivot O at the bottom of the frame and adapted to be swung to and from the work by an adj listing-screw O having a hand-wheel O for operating it. A spring 0 bears constantly against the frame 0 and takes up any slack or looseness which may exist at the adjusting-screw. -The work is supported and moved across the face of the grinder by mechanism which will now be described. At D is a knife-holder, pivotally supported at its ends in a carriage E, which is in turn supported upon a stationary shaft F, having a bearing at F in the main frame. The carriage E is free to rock upon shaft F and also to slide thereon, being provided with bushings E and E encircling the shaft. The knife-holder carries a form G, which is at all times in contact with a stationarily-located wheel G, supported upon the main frame by a standard G A spring G3, encircling a sliding rod G carrying an antifriction-roller G at its upper end, bears against the arm E v at the side of the carriage E opposite to that upon which the form and form-wheel are located and opposes the latter, so that the form is kept steadily against the wheel.

H is a belt-pulley mounted upon the shaft J, supported in the lower part of the frame and attached to this pulley is a heart-shaped cam H, made long in the direction of its axis, so that it may act in any position of the carriage E. An elbow-lever H freely mounted upon the bushing E as a pivotal support, bears at its lower end upon this cam, and at its upper end it is jointed to an arm D, depending from the knifeholder, by means of a pin D secured in a slide D moving'in a suitable way or recess D formed in the up per end of the lever. It will be seen from this construction that when the lever is actuated by the cam a rocking movement will be imparted to the knife-holder. In order to re tain the lever in contact with the cam, I provide a spring D encircling a sliding rod D passing through a horizontallyextending arm H upon the lever H and confined between said arm and the collar H upon the rod, the rod being stopped at its upper end in an arm D projecting from the knife-holder carriage E. The pressure of the spring D being downward upon the lever the latter is thereby kept closely against the cam and actuated in both directions, so as to cause a limited and regulated rocking of the knife-holder. As

the cam moves in unison with the drive-pulley II, it follows that this oscillating or rock.- ing movement of the holder will occur at each revolution of the pulley.

For the purpose of imparting a longitudinal movement to the carriage E necessary to carry the work across the grinding-wheel I provide the following mechanism: The pulley H is loose upon the shaft J, and a pinion K and a companion pinion K are journaled upon a stub-shaft h, secured in the web of said pulley H. Pinions K and K are made fast together, and the pinion K meshes with a gear K rigidly secured upon the shaft J, while the pinion K meshes with a gear K which is secured to the main frame and therefore stationary. The drive-pulley and the cam being both loose upon the shaft J it results that when the drive-pulley is in motion it carries the pinions with it, and the pinions are also compelled to rotate upon their own axis by reason of the fixed character of the gear K and this motion is transmitted through the gear K to the shaft J. The stationary gear has one or more teeth in excess of the number of teeth upon the moving gear K and consequently each time the pinions are carried around the main shaft a movement will be imparted to the gear K and the shaft equivalent to the number of excess teeth upon the stationary gear. This movement is of course very slow, and desirably so, because it enables me to impart a slow longitudinal movement to the carriage E through the medium of the cam L upon shaft J anda roller M, carried in a dependinglegM', formed upon the carriage E. The carriage is re turned at the end of each operation by a weight L, attached to the carriage by a cord L passing over a pulley L For the purpose of properly securing the knife to the holder I employ the following devices: Passing transversely through the holder is a slide N, having at its acting end a jaw N, adapted to conform to the bolster portion of the knife-blank, and a spring N adapted to bear against the outer end of the knife-handle. Astatio11aryjawN ,alsoshaped to conform to the bolster, is let into the holder opposite the jaw l and stationary abut.- ment-blocks N and N are also provided in the holder at the points indicated. The slide is drawn outward in such manner as to force the jaw N and the spring against the knife by a hand cam-lever N This cam-lever bears upon a block N secured to the holder and passing through a recess in the slide. For the purpose of supporting the middle portion of the knife-blade during the operation of grinding and preventing any tendency which it may have to bow or yield under the thrust of the grinder, I provide the screws N and N". I also place a support under the knife-blade at its farther end, consisting of a pin N eccentrically mounted in a short shaft N adapted to be turned by hand. My purpose in making this pin adjustable is in order that it may be raised to support the back edge of the blade when the other side thereof is ground. The, knife is usually placed in the machine first with the cutting-edge down, and after one side of the blade has been ground in this position it is reversed and the form changed, the pin N being raised to support the blade in the reversed position.

I claim- 1. The combination in a machine for grinding, of a pivoted holder for the blank to be ground adapted to oscillate, an oscillating and sliding carriage supporting the holder, automatic means for imparting the oscillatin g movement to the holder, automatic means for oscillating the carriage, and automatic means for sliding the carriage, substantially as specified.

2. In a knife grinding machine, a holder pivotally supported and provided with a clamp adapted to act upon the knife handle, mechanism for imparting oscillation to the holder, a carriage for said holder adapted both to oscillate and to slide, means for sliding the carriage and means for oscillating it, substantially as specified.

3. The combination with the grinding wheel, of the oscillating knife holder, a longitudinally moving and oscillating carriage supporting the holder, and a lever and cam for oscillating the holder, said lever moving with the carriage, substantially as specified.-

4. The combination with the grinding wheel, of the oscillating knife holder, a longitudinally moving carriage supporting said holder, the cam, the lever operated by the cam, and a spring acting upon the lever to keep it against the cam, substantially as specified.

5. The combination with the grinding Wheel, of an oscillating knife holder, an oscillating carriage supporting said holder, the cam, lever and spring for oscillating the holder, and the form, the opposing roller and the spring for oscillating the carriage, substantially as specified.

6. The combination in a knife holder of a knife holding clamp and a vertically adjustable support N for the edge of the blade, substantially as specified.

7. The knife holder having the vertically adjustable support N for the edge of the blade, substantially as specified.

8. The knife holder having one or more adjusting screws N N, bearing against the side of the blade and a vertically adjustable support N substantially as and for the purpose set forth.

9. In a machine for grinding table knives, the holder havinga slide N, bolster clamping jaws N N spring N bearing upon the blank and the cam lever-acting to draw the slide in giggiitening the clamp, substantially as speci- 10. In a grinding machine, the combination knife at the bolster, and a spring N adapted with the grinder, of an oscillating holder for to bear upon the rear of the handle, substan- 10 the work, a form roller and spring for controltially as specified. 4

v ling the holder and an oscillating and slidin 5 support for such holder, substantially as CHARLES ROBERTS specified. Witnesses:

I1. The knife holder having clamping de- CHARLES H. ROLLINS,

vices consisting of jaws, adapted to seize the MIOHAEL'W. GILTINON. 

